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2011年6月—2012年6月,在浙江省临安市典型板栗林样地布置施肥试验,研究板栗林土壤CO2通量与环境因子的关系.试验设置不施肥(对照)、施无机肥、有机肥及有机无机混合肥(1/2无机肥+1/2有机肥)4个处理.利用静态箱法测定土壤CO2排放速率,以及土壤温度、含水量和水溶性有机碳(WSOC)含量.结果表明:板栗林中土壤CO2排放呈现显著的季节性变化特征,最小值均出现在2月,最大值均出现在7、8月.施用无机肥、有机肥和有机无机混合肥的土壤年累积CO2通量比对照分别增加29.5%、47.0%和50.7%.施用无机肥的土壤WSOC含量(105.1 mg·kg-1)显著高于对照(76.6 mg·kg-1),但明显低于有机肥(133.0mg·kg-1)和混合肥处理(121.17 mg·kg-1).无机肥、有机肥和混合肥处理的土壤呼吸Q10值(1.75、1.49和1.57)均高于对照(1.47).土壤CO2排放速率与土壤5 cm温度、WSOC含量之间呈极显著正相关,但与土壤含水量没有明显的相关性.施肥导致土壤WSOC含量增加可能是板栗林地土壤CO2排放速率增加的原因之一.
In June 2011-June 2012, fertilization experiments were conducted on typical chestnut forest plots in Lin’an, Zhejiang Province to study the relationship between CO2 flux and environmental factors in chestnut forest. The experiment was conducted with no fertilization (control) Fertilizers and organic-inorganic fertilizers (1/2 inorganic fertilizer and 1/2 organic fertilizer) were used to measure soil CO2 emission rate, soil temperature, water content and water-soluble organic carbon (WSOC) The results showed that the soil CO2 emission in chestnut forest showed significant seasonal variation with the minimum values occurring in February and the maximum values occurring in July and August, respectively. The annual accumulated CO2 in soil with organic, inorganic and organic fertilizers The flux increased by 29.5%, 47.0% and 50.7% respectively compared with the control.The WSOC content in the soil treated with inorganic fertilizer (105.1 mg · kg-1) was significantly higher than that in the control (76.6 mg · kg-1) 133.0 mg · kg-1) and compound fertilizer (121.17 mg · kg-1) .The Q10 values of soil respiration (1.75, 1.49 and 1.57) were higher than those of the control (1.47) There was a significant positive correlation between CO2 emission rate and soil 5 cm temperature and WSOC content but no significant correlation with soil water content Correlation between fertilization leads to increased soil WSOC content may be one of the reasons chestnut woodland soil CO2 emission rate increases.